Magnetism and Matter Test -14

Question 1
1 / -0

Magnetic field intensity is defined as

A
Magnetic moment per unit volume

B
Magnetic induction force acting on a unit magnetic pole

C
Number of lines of force crossing per unit area

D
Number of lines of force crossing per unit volume

Question 2
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Assertion: We cannot think of magnetic field configuration with three poles.

Reason: A bar magnet does exert a torque on itself due to its own field.

(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion

(C) If assertion is true but reason is false.

(D) If the assertion and reason both are false.

A
A

B
B

C
C

D
D

Question 3
1 / -0

The susceptibility of paramagnetic substance is

A
Constant

B
Zero

C
Infinity

D
Depends on magnetic field

Question 4
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A bar magnet of magnetic moment M is cut into two equal parts perpendicular to its length. The magnetic moment of either part is

A
M

B
M/2

C
2M

D
0

Question 5
1 / -0

S. I unit of pole strength is

A
N

B
N/A−m

C
A − m

D
T

Question 6
1 / -0

A metallic rod of mass per unit length $$0.5$$ kg $$m^{-1}$$ is lying horizontally on a smooth inclined plane which makes an angle of $$30^o$$ with the horizontal. The rod is not allowed to slide down by a flowing a current through it when a magnetic field of induction $$0.25$$T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is?

A
$$14.76$$A

B
$$7.14$$A

C
$$11.32$$A

D
$$5.98$$A

Question 7
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Relation between magnetic moment and angular velocity is

A
$$M\propto \omega$$

B
$$M\propto \omega^{2}$$

C
$$M\propto \sqrt {\omega}$$

D
None of these

Question 8
1 / -0

Which of the following is true regarding dimagnetic substances (symbols have their usual meaning)?

A
$${ \mu }_{ r }>1,{ \chi }_{ m }>1$$

B
$${ \mu }_{ r }>1,{ \chi }_{ m }<1$$

C
$${ \mu }_{ r }<1,{ \chi }_{ m }<0$$

D
$${ \mu }_{ r }<1,{ \chi }_{ m }>0$$

Question 9
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According to Lenz's law there is conversion of

A
Momentum

B
Collision

C
Voltage

D
Energy

Question 10
1 / -0

The magnetic moment $$(\mu)$$ of a revolvng electron around the nucleus varies with principle quantum number n as

A
$$\mu \propto n$$

B
$$\mu \propto 1/n$$

C
$$\mu \propto n^2$$

D
$$\mu \propto 1/n^2$$

Question 11
1 / -0

The minimum magnetic dipole moment of electron in hydrogen atom is

A
$$\dfrac { eh }{ 2\pi m } $$

B
$$\dfrac { eh }{ 4\pi m } $$

C
$$\dfrac { eh }{ \pi m } $$

D
0

Question 12
1 / -0

The permanent magnetic moment of the atoms of a material is not zero. The material :

A
must be paramagnetic

B
must be diamagnetic

C
must be ferromagnetic

D
may be paramagnetic

Question 13
1 / -0

Magnetic moment of bar magnet is $$M$$. The work done in turning the magnet by $$90^o$$ in direction of magnetic field $$B$$ will be

A
Zero

B
$$\displaystyle\frac{1}{2}$$$$MB$$

C
$$3$$$$MB$$

D
$$MB$$

Question 14
1 / -0

A magnet of magnetic moment $$20\ CGS$$ units is freely suspended in a uniform magnetic field of intensity $$0.3\ CGS$$ units. The moment of work done in deflecting it by an angle of $$30^{\circ}$$ in $$CGS$$ units is

A
$$6$$

B
$$3\ \sqrt {3}$$

C
$$3(2 - \sqrt {3})$$

D
$$3$$

Question 15
1 / -0

A bar magnet placed in non-uniform magnetic field experiences.

A
Only torque

B
Only force

C
Both torque and force

D
Neither force not torque

Submit Test

Magnetism and M...

Question 1

Magnetic moment per unit volume

Magnetic induction force acting on a unit magnetic pole

Number of lines of force crossing per unit area

Number of lines of force crossing per unit volume

Question 2

A

B

C

D

Question 3

Constant

Zero

Infinity

Depends on magnetic field

Question 4

M

M/2

2M

0

Question 5

N

N/A−m

A − m

T

Question 6

$$14.76$$A

$$7.14$$A

$$11.32$$A

$$5.98$$A

Question 7

$$M\propto \omega$$

$$M\propto \omega^{2}$$

$$M\propto \sqrt {\omega}$$

None of these

Question 8

$${ \mu }_{ r }>1,{ \chi }_{ m }>1$$

$${ \mu }_{ r }>1,{ \chi }_{ m }<1$$

$${ \mu }_{ r }<1,{ \chi }_{ m }<0$$

$${ \mu }_{ r }<1,{ \chi }_{ m }>0$$

Question 9

Momentum

Collision

Voltage

Energy

Question 10

$$\mu \propto n$$

$$\mu \propto 1/n$$

$$\mu \propto n^2$$

$$\mu \propto 1/n^2$$

Question 11

$$\dfrac { eh }{ 2\pi m } $$

$$\dfrac { eh }{ 4\pi m } $$

$$\dfrac { eh }{ \pi m } $$

0

Question 12

must be paramagnetic

must be diamagnetic

must be ferromagnetic

may be paramagnetic

Question 13

Zero

$$\displaystyle\frac{1}{2}$$$$MB$$

$$3$$$$MB$$

$$MB$$

Question 14

$$6$$

$$3\ \sqrt {3}$$

$$3(2 - \sqrt {3})$$

$$3$$

Question 15

Only torque

Only force

Both torque and force

Neither force not torque

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